Front Drive Shaft Update

[ECrider]

There is no question that a DC at one end will increase the angle of the CV at the pinion. Is this enough to cause an issue with the CV? Sounds like Dokatd has an answer to that question in the works. The issue of shaft length could be improved by changing the output flange of the transfer case so that the flange of the DC would bolt on directly without an adapter. Or the DC joint could have a custom designed flange that bolts directly to the TC output.

I believe the shaft in the photo was built by Sven. But he went dark after posting that.

hopefully didn't fall out of a closed hospital window...

 

[TCMColorado]

Wasn't there a guy who got denied based on the way he "Drove" his vehicle. He had a bone stock truck and I believe he was in Europe.

Yikes, I would like to think my dealer would not speculate as to the appropriate usage of the vehicle. But it is hard to have any faith in the Ineos dealer network.

 

[CRH]

Yikes, I would like to think my dealer would not speculate as to the appropriate usage of the vehicle. But it is hard to have any faith in the Ineos dealer network.

that would be lies for the internet rumour mill

 

[Logsplitter]

I guess the data recorder in the Grenadier stores a lot of relevant info in the event of a warranty or insurance claim.

 

[TD5-90]

I guess the data recorder in the Grenadier stores a lot of relevant info in the event of a warranty or insurance claim.

Are you serious??

 

[Texas Grenadier]

Are you serious??

Yeah - look under your drivers seat, there is a little black box that records like a 747.

 

[TCMColorado]

Every new vehicle sold in the US has this type of "blackbox". At least the Grenadier does not have over the air data sharing, so I am told.

 

[Tazzieman]

The Black Box Big Brother thread

Thread 'Event Data Recorder (EDR, "black box") or other recording devices in the Grenadier?'

Dec 18, 2023

Does anyone know the state of EDRs in Canada/USA? e.g. legislation or requirements?

Based on INEOS possibly being more agressive than required with ADAS features (several threads on this), I'm just wondering if they're also installing other data collection devices that owners may want to know about.

• holdmybeer
• event grenadier
• Replies: 6
• Forum: Electrical, ECU, HVAC, Lights & Infotainment

 

[Dokatd]

These black boxes have been in vehicles in one form or another since the 90's.

 

[MK898]

Geschwindigkeiten?

100kmh - 140 kmh

 

[255/85]

100kmh - 140 kmh

I'd venture that speed isn't the killer per se. High rpm would be a bigger concern. Those little balls moving back and forth at a high rate inside the assembly cause a lot of frictional heat.

Yeah, yeah, I know. That's what she said.

 

[MileHigh]

Stupid idea of the day. I see that the replacement driveshafts have an issue with harmonics. What happens if you took the concept of putting those balls in the tires to help with balancing and applied it to the driveshaft? I don’t know how exactly it would work, but something to change the resonance?

 

[255/85]

That's a clever idea. The centripetal force might be too low to have much effect because of the inside diameter of the drivesheft/propshaft tube. The balls might all just settle in the lower end of the tube. It would take 'rithmatic to know for sure. That counts me out.

 

[TCMColorado]

Balancing balls/beads will not work for drive shafts. The vibrations are a result of the geometry inherent to how u-joints function. The shafts themselves are fully balanced during fabrication.

 

[Clark Kent]

Stupid idea of the day. I see that the replacement driveshafts have an issue with harmonics. What happens if you took the concept of putting those balls in the tires to help with balancing and applied it to the driveshaft? I don’t know how exactly it would work, but something to change the resonance?

Your thinking is sound. Four cylinder engines have used balance shafts for years to make them feel smooth.

I'm from the helicopter world. Large helicopters use tuned mass dampers to counteract undesirable vibrations at frequencies that are either damaging to sensitive equipment like mechanical gyros, or uncomfortable and fatiguing to crew and pax.

This YouTube is a UH60 cabin roof passive damper in action. It's normally hidden away behind the soundproofing. It's like a mechanical version of active noise cancellation. The mass is tuned to flap in the opposite direction to the target vibration so it cancels out the displacement (cancellation of vectors).

A speed sensitive active damping system for a driveshaft could be developed but it would be expensive and impractical. It would be masking an undesirable vibration that could damage the drivetrain over time - TBD. It addresses the symptoms not the problem.

View: https://youtu.be/rXEhcLG37VQ?si=24Dfgw1DnXnvsEUl

 

[pmatusov]

A speed sensitive active damping system for a driveshaft could be developed but it would be expensive and impractical.

It isn't the proper solution to the issue at hand, but a driveshaft vibration damper could be made quite easily. Imagine a toroidal mass attached to the driveshaft yoke with a rubber sheet and a flat flange - on the transfer case side, it won't interfere with anything.
You inspired me to tinker with passive/active NVH suppression in a Gren.

 

[Dokatd]

Lots of vehicles have damper masses. Land Rover had them on the DiscoII and I feel like I recall them on the Rangie. Toyota uses them on their T-cases. They are just metal masses mounted to a fairly stiff rubber block. They work, but they require fine tuning for sure.

 

[Clark Kent]

It isn't the proper solution to the issue at hand, but a driveshaft vibration damper could be made quite easily. Imagine a toroidal mass attached to the driveshaft yoke with a rubber sheet and a flat flange - on the transfer case side, it won't interfere with anything.
You inspired me to tinker with passive/active NVH suppression in a Gren.

I'd like to see the spectrum from an accelerometer mounted on the output flange housing. It would need to be filtered to eliminate all the spinny bits and meshing in the transfer case and we don't have that data, but the driveshaft rpm could be derived from the wheel speed to look for the correct peak/s.
Ideally a standard driveshaft would be mapped alongside a hybrid shaft to get a baseline signature so the spectrum noise from the uni joint could be identified. That would give something to target for a tuned damper. Is the hybrid driveshaft uni resonance in a narrow or broad speed range?

This or a cut and turn?

 

[Zimm]

Lots of vehicles have damper masses. Land Rover had them on the DiscoII and I feel like I recall them on the Rangie. Toyota uses them on their T-cases. They are just metal masses mounted to a fairly stiff rubber block. They work, but they require fine tuning for sure.

The 100 series has then on the frame.

The mass on an out of phase driveshaft would be nice for something like a generator that operates at one rpm.

So, we put a damper on the driveshaft, and move the transmission to the rear differential and make it a cvt…

Nothing like collaboration to solve a problem.

 

[MK898]

I'd venture that speed isn't the killer per se. High rpm would be a bigger concern. Those little balls moving back and forth at a high rate inside the assembly cause a lot of frictional heat.

Yeah, yeah, I know. That's what she said.

High RPMs occur because of high speeds; it’s all connected. The driveshaft rotates four times when the tire rotates once.